The Investgation Of Optical Transition In Er³⁺ Doped ZBLAN Glasses

The excited state absorption cross sections for ⁴I_13/2→⁴S_3/2 and ⁴I_13/2→⁴I_11/2 transitions in Er³⁺ doped ZBLAN were achieved by using the reciprocity relationship in the framework of McCumber theory. The McCumber theory is relative to the Judd-Ofelt intensity parameters, thus the precision in J-O theoretical calculation is quite important. Optical transition intensity parameters of Er³⁺ in ZBLAN were carefully calculated, and the obtained results were compared with those reported by others.The emission cross sections of ⁴S_3/2→⁴I_13/2 and ⁴I(11/2)→⁴I_13/2 transitions were confirmed according to the Fuchtbauer -Ladenburg (FL) formula. The excited state absorption cross sections for ⁴I_13/2→⁴S_3/2 and ⁴I_13/2→⁴I_11/2 transitions were achieved by using the reciprocity relationship in the framework of McCumber theory. The laser gain properties of ⁴S_3/2→⁴I_13/2 and ⁴I_11/2→⁴I_13/2 transitions were discussed.